Carry out motor vehicle body metal inert gas (MIG) brazing operations

Business Sectors (Suites): Vehicle Body Repair
Developed by: IMI
Approved on: 30 Mar 2023


This standard is about joining materials correctly and effectively using metal inert gas (MIG) brazing techniques and procedures.

Brazing involves melting the filler metal without melting the parent metal in the heat affected zone (HAZ), a non-fusion welding process, effectively sticking two metal surfaces together.

Performance criteria

You must be able to:

P1 use the appropriate personal protective equipment (PPE) and check it is fit for purpose before carrying out MIG brazing operations 
P2 protect the vehicle and its contents effectively when carrying out MIG brazing operations 
P3 prepare material and align to enable suitable join to be achieved, ensuring mating flanges are treated following manufacturers' procedures before joining  
P4 select, set up and use the correct tools and equipment for carrying out MIG brazing operations 
P5 ensure that the tools, equipment and PPE you require are in a safe working condition 
P6 set up your equipment to carry out MIG brazing operations by checking:

P6.1 suitability of gas/filler wire and size for material to be joined
P6.2 parameters are set correctly
P6.3 consumables are correct
P6.4 feed rollers and welding tips 
P7 carry out MIG brazing operations following: 

P7.1 recognised researched repair methods
P7.2 test procedures including providing test coupons on equivalent material in accordance with recognised standards
P7.3 manufacturers processes, methods and procedures
P7.4 your workplace procedures
P7.5 health, safety and legal requirements 
P8 avoid damaging other components, standards, panels and surfaces on the vehicle and the surrounding work area 
P9 recognise when your braze is not forming correctly and what action needs to be taken 
P10 inspect and assess MIG braze weld quality in accordance to recognised standards 
P11 check integrity of braze and record the type of joint achieved on the appropriate paper work 
P12 ensure test pieces are recorded and stored 
P13 check the joint area without reducing material thickness and protect the repaired area to inhibit corrosion where applicable 
P14 clean and store PPE and equipment correctly  
P15 promptly report any additional faults you notice during the course of your work to the relevant person(s)  
P16 promptly report any delays in completing your work to the relevant person(s)  
P17 carry out MIG brazing operations within the agreed timescale
P18 complete work records accurately, in the format required and promptly pass them to the relevant person(s) promptly

Knowledge and Understanding

You need to know and understand:

​K1 the health, safety and legal requirements relating to the joining of materials using MIG brazing techniques 

K2 your workplace procedures for: 

K2.1 the referral of problems 
K2.2 reporting of delays to the completion of work 
K2.3 completion of work records 
K3 the work that needs to be done and the standard required 
K4 the requirements for protecting the vehicle and contents from damage before, during and after the joining of materials using MIG brazing techniques 
K5 the importance of selecting, using, maintaining and storing the appropriate PPE when the joining of materials using MIG brazing techniques 
K6 how to find, interpret and use sources of information and repair methods applicable to the joining of materials using MIG brazing techniques and the implications of not fully understanding the repair methods presented 
K7 how to select, check, maintain and set up all of the tools and equipment required to correctly join materials using MIG brazing techniques 
K8 the different types of processes, techniques and joints used for the joining of materials when using MIG brazing techniques 
K9 the correct surface preparation methods to ensure a good MIG braze joint is achieved 
K10 the faults and defects that can occur when carrying out MIG brazing and the common causes of these faults 
K11 the need for correct alignment of materials and the methods used to achieve this 
K12 the types of quality control checks that can be used to ensure correct joining of materials 
K13 how to inspect and assess MIG brazing in accordance with recognised standards 
K14 when MIG brazing should be used to join materials 
K15 the difference between MIG brazing techniques and other welding methods  

K16 the different types of joint that can be used to join materials using MIG brazing, including:

K16.1 lap slot
K16.2 lap seam
K16.3 butt joint
K17 the implications of electro-magnetic fields and the effects on medical devices


All of the items listed below form part of this National Occupational Standard.

1. Personal protective equipment (PPE) for MIG brazing operations includes: 

1.1. face mask with appropriate eye protection 
1.2. protective/flame retardant coveralls 
1.3. protective/flame retardant gauntlets 
1.4. steel toe cap boots 
1.5. appropriate vehicle protection 
1.6. appropriate protection for others in the workshop 
1.7. appropriate fume mask

2. Tools and Equipment are: 

2.1. workshop equipment 
2.2. generic hand tools 
2.3. manufacturer's specified and specialist tools
2.4. fume extraction equipment

Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

30 Mar 2026





Originating Organisation


Original URN


Relevant Occupations

Accident Repair Technicians, Body Repair and Alignment Technician (Automotive), Body Repair Technician (Automotive)

SOC Code



Motor; vehicle; body; resistance; MIG; brazing; operations;